问题补充:
— Mum, my friends are waiting for me outside. May I go out to play with them?
— Yes, you , but be careful, please.
A. shall
B. must
C. may
D. should
答案:
A. shall
B. must
(答案→)C. may
D. should
解析:A. shall 将会 B. must必须 C. may 可以 D. should应该;句意:妈妈,我的朋友们正在外面等我,我可以出去和他们玩吗?是的,你可以,但是请小心点。故选C